Well I was at first impressed by the vast amount of knowledge on these forums, but now realise is can be easily spoilt by people who argue between themselves, instead of actually helping.
Anyway, I agree that looking at different ATC units will undoubtedly uncover different aspects and different opinions/advice, so surely it is worth sorting as many visits as possible...
I work at an RAF Unit, and we certainly welcome potential controllers/assistants to the Tower for visits, and are as accommodating and helpful as we can be.
Cheers,